Knob



FIG. 1 is a perspective view of a knob showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a first side view thereof;

FIG. 4 is a second side view thereof;

FIG. 5 is a transverse cross-sectional view thereof; and,

FIG. 6 is a rear end view thereof. 

The ornamental design for a knob, as shown and described. 